It's killing me in this half hour with a close ally of the US in his state of serious turmoil. Anti government protest in Turkey are now in their fifth the day and the largest most violent demonstrations seen in that country in years. ABC's Alex mark -- reports on the anger and it's aimed at one man. This is a moment said to have helped spark -- at all Turkish police pepper spraying a young woman at point blank range. What had been a small protest about a -- exploded the years of pent up anger Turkey's leader now unleashed. -- -- These protesters are pulling up concrete blocks then slaps a tree is barricade here to block the police and it's clear that after several days of these massive protest. Neither side. The biggest protest this country has seen in decades unimaginable. Just. Weeks ago many of the protesters -- -- the prime minister is becoming a dictator who wanted to step down. And -- you can see here that the protesters are digging in for a long fight. The anger is aimed at this man prime minister -- -- tell you -- to want it they say he has clamped down on their freedom of speech. As restricted alcohol sales. It's pushing a strict brand of Islam but for the US he has been a reliable and key ally -- the support the US and bringing down the Asad regime in Syria. And funnels American aid to the rebels he also is always a big role in the Israeli Palestinian peace process. US says it's concerned by the use of excessive force against the protesters. And is encouraging restraint it's too early to say whether the Arab Spring has now spread to Turkey. But what is clear is that yet another of America's closest friends in the region is under fire. Alex Marquardt ABC news system.

This transcript has been automatically generated and may not be 100% accurate.

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